11.   Since the Elizabeth center was closed, the agency has been holding detainees in a number of county jails in Pennsylvania.

12.   The detainees are held on the basis of evidence introduced by the government, evidence the accused cannot see or challenge at immigration hearings.

13.   There are no federal detention centers along the Southwest border, so federal detainees are held in local jails.

14.   Under the U.S. Patriot Act, the government has the power to hold detainees for up to six months.

15.   Where the detainees are being held also is unclear.

16.   Police raided at least two offices of non-government groups, seizing computers and holding the detainees who were released after hours-long questioning.

17.   Police raided at least two offices of nongovernment groups, seizing computers and holding the detainees who were released after hours-long questioning.

18.   Pakistani law allows the government to hold detainees without charge for there months, and the detention period expired Friday.

19.   Pending periodic reviews, ISA detainees can be held without trial indefinitely.

20.   Police say the detainees are being held for questioning in connection with the Karachi attacks.